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No. 284,190. I I Patented Sept. 4, 1883.

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SEWING MACHINE. I No. 284,190. Patented Sept. 4, 1883.

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Patented Sept. 4, 1883.

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No. 284,190. Patented Sept. 4, 1883.

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. UNITED STATES PATENT OFFICE. Y

JULIUS ALBERT DoEING, E LEIPSIO, GERMANY.

SEWING-MACHINES SPECIFICATION forming part of Letters Patent No; 284,190, dated September 4, 1883.

Application filed September 27, 1882. (No model.) I

T0 at whom it may concern:

M Be it known that I, J U IUs ALBERT Don- ING, a citizen of Germany, residing at the city of Leipsic, in the Empire of Germany, have invented a new and useful Improvement in Sewing-Machines, of which the following is a specification.

In the accompanying drawings, Figurelis a section of a sewingmachine embodying my invention. Fig. 2 is a reversed plan of the same. Fig. 3 is a section, and Fig. 4 a top View, (enlarged,) of the shuttle and disk-bobbin and proximate devices. Figs. 5 to 19 represent details and different positions referred to in the specification. Figs. 20 to'27 represent different views of my improved disk-bobbin and proximate devices referred to in the following specification.

Similar letters represent similar parts in all the figures. i

In the top plate or table of the sewing-machine, close behind the needle, a circular receptacle, K, is attached. Near the lower part, in the inside of this receptacle, a small pro- 2 5 jecting rim, 1', is arranged, upon which the shuttle S is supported. The inside of the receptacle K and the outside of the shuttle S are made slightly conicalthat is, the inner face of the receptacle flares upward and outward and the outer face of the shuttle fits the same to allow for the wear of the shuttle, and thereby insure the accurate fit of thevshuttle at all times in the inside of the receptacle K. The shuttle S is provided with a circular recess 3 5 to receivethe bobbin or thread-spool, and with a suitable recess at one side, one endof which forms the necessary hook g, which passes into the loop of the needle-thread, and holds said loop while the same passes around the shuttle 40 S. The recess or cavity to receive the bobbin or thread-spool Zis central in the shuttle, and the bobbin or thread-spooll is kept in its place by a small plate or cover, m, having a hole, 1', eccentric to the'center of the bobbin, for the 5 purpose hereinafter described, through which the spool-thread passes. I

In the bottom of the receptacle K a disk, A, is arranged, receiving the required rotating motion through the gear-wheels 30 and shaft N. The center of this disk A is some distance behind the center of the shuttle S, and consequently eccentric to thesame; and the disk A S before its hook g, to give motion to said shuttle S. On account of the center of the disk A being eccentric to the center of the shuttle S,a peculiar motion is produced by the pin bin the recess in the side of the shuttle S,

for the purpose hereinafter described.

' Figs. 4a'nd 7 illustrate the ordinary tension device, P, provided with a scale, 31, to indicate is provided with a projecting driving-pin, Z), engaging into the recess in the side of the shuttle the proper amount of tension for the material slightly-conical cup, at, is placed, provided.

with an upper external rim, w, and a central sleeve, 0. The outside diameter of the external rim, 00, and the diameter of the bottom of the cup .10 correspond with each other and fit exactly into the recess in the center of the shuttle S, and the sleeve 0 fits over a central pin, 2, firmly attached to the shuttle S, and provided with a conical head, w, and over the sleeve 0 the thread-bobbin Z is placed. The cup 00 is free to move on the pin z, and the bobbin Z moves freely around the sleeve 0. In the side of the cup at a hole, 33, is made, and in the projecting rim w of said cup two or more holes, 22, are made. The thread from the bobbin Z is passed through the hole 33, wound two or three times around the outside of the cup at, and then passes through one or more of the holes '0 in the rim w, and lastly through the above-mentioned hole 6, eccentrically made in the cover m, to the outside of the shuttle. This arrangement of the spool-thread, after leaving the spool Z until it passes. through the hole 2, gives. the desired necessary tension to said thread, and has the advantage that this tension will always remain the same, independent of the diameter of thread'wound upon the spool.

The operation is as follows: When the needle Thas arrived at its lowest point of motion,

This tension device requires the spool Figs. 12 and 13, the hook g of the shuttle s passes through. the needle-thread, forming a loop, which is retained in the recess near the hook g, and passed by the further motion of the shuttle S around'the body of the same,

Fig. 15, without much friction, as the shuttle ,hole 1', Figs. 16 and 17. The upward motion of the needle T carries this loop with it until said loop comes into aposition in the recess of the shuttle to pass out of the same behind the driving-bolt I) clear of the shuttle S, Figs. 18 and 19. In the forward end of this recess, in the side of the shuttle, a very small cavity, u, (see. Figs. and 19,) is made, which this loop must pass before it leaves the shuttle, and wherein saidloop is retained in consequence of the cocentric -motion of the driving-bolt 1) coming in that position, Fig. 19, directly in front of said cavity to, (or loop-retainer,) until the upward motion of the needle T has produced the required necessary tension on its needlethread. The required necessary strain or tension to the spool-thread in the formation of the stitch independent 'to the tension given to the spool-thread while leaving the spool, and which is an essential point in the production of a regular firm seam, 'is produced by the above-mentioned eccentricposition of the hole t, which, during the formation of the loop, is I Q nearest to the needle T, (see Figs. 13 and 15,) and farthest away from the needle T where the loop is drawn'taut. (See Figs. 17 and 19.)

What I claim as my invention, and desire to secure by Letters Patent, is

1. A rotating shuttle, a threadspool con-' tained therein, and a cover having a hole eccentric to said shuttle, in combinationwith a cup, or, exterior to said shuttle, in contact with which cup the thread passes between said spool and said cover for purposes of tension.

2. In combination with theshuttle S and thread-spool Z, the cup 0'0, with rim :20, hole 33, and two or more holes, '11, in its rim 0:, arranged to operate in combination with the spoolthread, substantially as and for thepurpose set forth.

JULIUs ALBERT DORING. 

